Ok guys with racing season coming up and a few trips to the strip have been planned so I was thinking which gear oil I should use. Right now I am running straight GM Synchromesh and it doesn't feel as smooth as when I had half Redline MT-90 and half Synchromesh. So I was looking online at Redline's selection of tranny and diff. oils and thought I didn't know enough to choose the correct one. For the tranny(R-154) I was thinking MT-90 and for the rear end I was thinking Lightweight Shockproof. Any thoughts or suggestions?
What Gear Oil?
- Thread starter aye mate
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I think both are great but I choose Amsoil.
Tranny-Amsoil 75/90
Engine-Amsoil 2000 Series 20/50
I forget the rear diff fluid type.
Duane
Tranny-Amsoil 75/90
Engine-Amsoil 2000 Series 20/50
I forget the rear diff fluid type.
Duane
I just put MT-90 and a small bit of ATF in my tranny today. Got Redline 75/90 and 75/90ns LSD to prevent locking/loudness and such, but haven't gotten to putting it in yet cuz of the awkwardness of filling, and me not having a pump.
I hear the additive in Transmission fluid is bad for the Diff.
I hear the additive in Transmission fluid is bad for the Diff.
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As the man said, do not use straight NS or chattering will result. Use the non-NS or NS with a modifier. When I had my stock LSD I prefered tuning with the FoMoCo modifer but the RL stuff will also work. ATF? Yikes...
jetjock said:
It helps on cold mornings as my transmission doesn't like to shift when cold.
I'm using NS and 75/90 together
Eck...I meant the post for the LSD oil thread. I'm not even in the right thread here 
. For the tranny try this guy I know. He's a lube chemist. All his formulations are state of the art and still affordable. He'll even tweak them for you. Good stuff. Btw, some manual trannies spec ATF. Just not ours.
http://tinyurl.com/kx9cb
. For the tranny try this guy I know. He's a lube chemist. All his formulations are state of the art and still affordable. He'll even tweak them for you. Good stuff. Btw, some manual trannies spec ATF. Just not ours.http://tinyurl.com/kx9cb
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jetjock said:
I understand a LSD modifer will eliminate chatter...how much do you use? The differential uses about 1.5 quarts...will a problem result if too much modifer is added?
I use Redline heavy shock proof gear lube in my 4runner's Rear axle. I have 5.29's, Detroit Locker and big M/T tires bolted to it. I beat the crap out of it. that redline holds up dang well. my Locker operation got quieter too. In my trans and Transfer case I run Redline MT90. I've had AWSOME Luck with all of it. driveline got a lot quieter. I ran mobil syn 75/90? gear lube and had some bad experiences with it. broke a bunch of teeth off the front ring gear doing some light wheeling. I think in gears thicker is better generally.
Our rear end made tons of chatter, i changed the fluid out to cheap 80/90 (its got a leak) and dumped a whole tube of LSD friction modifier. I think it was like 7oz? the whole tube from Autozone or whatever.
Our rear end made tons of chatter, i changed the fluid out to cheap 80/90 (its got a leak) and dumped a whole tube of LSD friction modifier. I think it was like 7oz? the whole tube from Autozone or whatever.
Yesterday at the track I was heating up my DRs and the pass. side wheel stopped spinning about 5 secs into the burnout. Right now I have some cheap 80w90 tractor gear oil in there. I have 2 quarts of Amsoil 75w90 and I'm gonna get some friction modifier in there also.
jdub said:
If you go with Redline just use the 75W90 as it already has FM in it. If using NS you can add either the RL or Ford modifer. Use half of the 4 ounce bottle and go from there. I dunno what's in the Ford FM but it's some unbelievably nasty smelling stuff. Try and not get any on you and I shudder at what'd happen if a bottle got spilled inside a car's interior.
This is all for the rear end. Under no circumstances do you want a friction modifier in your transmission.
jetjock said:
I put MT90 in my trans about 2 years ago. It was making a very slight grinding feeling through the stick going into 1st and 2nd. After the MT90 was in there it shifted purfect after driving a few miles, and it has been purfect ever since. In my 4.30 diff I used Mobile1 75w90 (it was cheap and easy to get) and 1/2 bottle of Ford friction modifier. It was working great until I started getting it sideways on drag radials. It had a lot of body roll back then so a few times one wheel picked up and spun and (with 395 ft/lbs and one smoking tire) the diff was toast pretty damn quick.
MT90 is good stuff. I've run MTL in the tranny but now use a lube blended for me by the guy in the link I posted above. I run a Torsen in the diff now, also using his stuff.
Man, what's in that Ford stuff that makes it so foul? Lol, someone said it was whale oil. For all I know it could be but it sure seems to work well.
Pomona huh? Do they still have the big car show at the fairgrounds? Been years since I've visited Brackett Field.
Man, what's in that Ford stuff that makes it so foul? Lol, someone said it was whale oil. For all I know it could be but it sure seems to work well.
Pomona huh? Do they still have the big car show at the fairgrounds? Been years since I've visited Brackett Field.
I don't know much about GM Synchromesh but I've heard it's mineral oil based and has friction modifiers in it. A quick Google search didn't confim that though so I may well be wrong.
The problem with using FMs in a tranny is they interfere with snychro operation.
Since some trannies (not ours) spec ATF this is a commom problem in those that use it as many of the newer ATFs are friction modified. The bottom line is one must be careful when choosing a tranny oil but if you're getting good results with the GM stuff that's all that matters.
On the other hand what you put in the diff is important from a FM sense but in the other direction. The bottom line here is to change it more often than most people do because it lives a tough life and there's so little of it in there to begin with.
The problem with using FMs in a tranny is they interfere with snychro operation.
Since some trannies (not ours) spec ATF this is a commom problem in those that use it as many of the newer ATFs are friction modified. The bottom line is one must be careful when choosing a tranny oil but if you're getting good results with the GM stuff that's all that matters.
On the other hand what you put in the diff is important from a FM sense but in the other direction. The bottom line here is to change it more often than most people do because it lives a tough life and there's so little of it in there to begin with.